MONGODB（四）——DBObject与JavaBean转换

* 将实体Bean对象转换成DBObject * */ public static <T> DBObject beanToDBObject(T bean) throws IllegalArgumentException, IllegalAccessException { if (bean == null) return null; DBObject dbObject = new BasicDBObject(); // 获取对象类的属性域 Field[] fields = bean.getClass().getDeclaredFields(); for (Field field : fields) { // 获取变量的属性名 String varName = field.getName(); // 修改访问控制权限 boolean accessFlag = field.isAccessible(); if (!accessFlag) { field.setAccessible(true); } Object param = field.get(bean); if (param == null) { continue; } else if (param instanceof Integer) { // 判断变量的类型 int value = ((Integer) param).intValue(); dbObject.put(varName, value); } else if (param instanceof String) { String value = (String) param; dbObject.put(varName, value); } else if (param instanceof Double) { double value = ((Double) param).doubleValue(); dbObject.put(varName, value); } else if (param instanceof Float) { float value = ((Float) param).floatValue(); dbObject.put(varName, value); } else if (param instanceof Long) { long value = ((Long) param).longValue(); dbObject.put(varName, value); } else if (param instanceof Boolean) { boolean value = ((Boolean) param).booleanValue(); dbObject.put(varName, value); } else if (param instanceof Date) { Date value = (Date) param; dbObject.put(varName, value); } // 恢复访问控制权限 field.setAccessible(accessFlag); } return dbObject; }

 

二、 JavaBean转为DBObject 

      <span style="color: #008000;">/**</span><span style="color: #008000;">
     * 将DBObject转换成Bean对象
     * 
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <T><span style="color: #000000;"> T dbObjectToBean(DBObject dbObject, T bean)
            </span><span style="color: #0000ff;">throws</span><span style="color: #000000;"> IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {
        </span><span style="color: #0000ff;">if</span> (bean == <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
            </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">null</span><span style="color: #000000;">;
        }
        Field[] fields </span>=<span style="color: #000000;"> bean.getClass().getDeclaredFields();
        </span><span style="color: #0000ff;">for</span><span style="color: #000000;"> (Field field : fields) {
            String varName </span>=<span style="color: #000000;"> field.getName();
            Object object </span>=<span style="color: #000000;"> dbObject.get(varName);
            </span><span style="color: #0000ff;">if</span> (object != <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
                BeanUtils.setProperty(bean, varName, object);
            }
        }
        </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> bean;
    }
    </span><span style="color: #008000;">//</span><span style="color: #008000;"> 取出Mongo中的属性值，为bean赋值</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <T> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setProperty(T bean, String varName, T object) {
        varName </span>= varName.substring(0, 1).toUpperCase() + varName.substring(1<span style="color: #000000;">);
        </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {
            String type </span>=<span style="color: #000000;"> object.getClass().getName();
            </span><span style="color: #008000;">//</span><span style="color: #008000;"> 类型为String</span>
            <span style="color: #0000ff;">if</span> (type.equals("java.lang.String"<span style="color: #000000;">)) {
                Method m </span>= bean.getClass().getMethod("get" +<span style="color: #000000;"> varName);
                String value </span>=<span style="color: #000000;"> (String) m.invoke(bean);
                </span><span style="color: #0000ff;">if</span> (value == <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
                    m </span>=<span style="color: #000000;"> bean.getClass()
                            .getMethod(</span>"set" + varName, String.<span style="color: #0000ff;">class</span><span style="color: #000000;">);
                    m.invoke(bean, object);
                }
            }
            </span><span style="color: #008000;">//</span><span style="color: #008000;"> 类型为Integer</span>
            <span style="color: #0000ff;">if</span> (type.equals("java.lang.Integer"<span style="color: #000000;">)) {
                Method m </span>= bean.getClass().getMethod("get" +<span style="color: #000000;"> varName);
                String value </span>=<span style="color: #000000;"> (String) m.invoke(bean);
                </span><span style="color: #0000ff;">if</span> (value == <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
                    m </span>= bean.getClass().getMethod("set" +<span style="color: #000000;"> varName,
                            Integer.</span><span style="color: #0000ff;">class</span><span style="color: #000000;">);
                    m.invoke(bean, object);
                }
            }
            </span><span style="color: #008000;">//</span><span style="color: #008000;"> 类型为Boolean</span>
            <span style="color: #0000ff;">if</span> (type.equals("java.lang.Boolean"<span style="color: #000000;">)) {
                Method m </span>= bean.getClass().getMethod("get" +<span style="color: #000000;"> varName);
                String value </span>=<span style="color: #000000;"> (String) m.invoke(bean);
                </span><span style="color: #0000ff;">if</span> (value == <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
                    m </span>= bean.getClass().getMethod("set" +<span style="color: #000000;"> varName,
                            Boolean.</span><span style="color: #0000ff;">class</span><span style="color: #000000;">);
                    m.invoke(bean, object);
                }
            }
        } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (NoSuchMethodException e) {
            e.printStackTrace();
        } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (SecurityException e) {
            e.printStackTrace();
        } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (IllegalAccessException e) {
            e.printStackTrace();
        } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (IllegalArgumentException e) {
            e.printStackTrace();
        } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (InvocationTargetException e) {
            e.printStackTrace();
        }
    }</span>

 

MONGODB（四）——DBObject与JavaBean转换

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